Liquid-liquid extraction of niobium(V) in the presence of other metals with high molecular mass amines and ascorbic acid

M A Karve; S M Khopkar

doi:10.1016/0039-9140(93)80051-r

Liquid-liquid extraction of niobium(V) in the presence of other metals with high molecular mass amines and ascorbic acid

Talanta. 1993 Jun;40(6):913-7. doi: 10.1016/0039-9140(93)80051-r.

Authors

M A Karve¹, S M Khopkar

Affiliation

¹ Department of Chemistry, Indian Institute of Technology, Bombay 400 076, India.

PMID: 18965727
DOI: 10.1016/0039-9140(93)80051-r

Abstract

A novel method is proposed for the solvent extraction of niobium(V). A 0.1M solution of Aliquat 336S in xylene quantitatively extracts microgram quantities of niobium(V) from 0.01M ascorbic acid at pH 3.5-6.5. Niobium from the organic phase is stripped with 0.5M nitric acid and determined spectrophotometrically in the aqueous phase as its complex with TAR. The method permits separation of niobium not only from tantalum(V) but also from vanadium(IV), titanium(IV), zirconium(IV), thorium(IV), chromium(III), molybdenum(VI), uranium(VI), iron(III), etc. Niobium from stainless steel was determined with a precision of 0.42%.